From 32513a7745b606dc8b33c8a4c722aaa026752283 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mateusz=20Burzy=C5=84ski?= <mateuszburzynski@gmail.com>
Date: Thu, 31 Oct 2024 23:18:27 +0100
Subject: [PATCH] Fixed an accidental `undefined` leak into
 `getAccessibleSymbolChain`'s cache key (#58669)

---
 src/compiler/checker.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index ea5971b3f7b..ce0291367b5 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -5566,7 +5566,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         const cache = (links.accessibleChainCache ||= new Map());
         // Go from enclosingDeclaration to the first scope we check, so the cache is keyed off the scope and thus shared more
         const firstRelevantLocation = forEachSymbolTableInScope(enclosingDeclaration, (_, __, ___, node) => node);
-        const key = `${useOnlyExternalAliasing ? 0 : 1}|${firstRelevantLocation && getNodeId(firstRelevantLocation)}|${meaning}`;
+        const key = `${useOnlyExternalAliasing ? 0 : 1}|${firstRelevantLocation ? getNodeId(firstRelevantLocation) : 0}|${meaning}`;
         if (cache.has(key)) {
             return cache.get(key);
         }